On Fri, Sep 16, 2016 at 1:32 PM, Nicolas Ecarnot <nicolas@ecarnot.net> wrote:

Le 15/09/2016 à 23:27, Edward Haas a écrit :

On Thu, Sep 15, 2016 at 3:43 PM, Nicolas Ecarnot <nicolas@ecarnot.net> wrote:

Hello,

I'm trying to setup a nested oVirt for the first time, and according to what I read around and experience, some special network settings have to be chosen.

For this first try, the bare-metal host is a Debian, running KVM, and the virtual NICs are setup as macvtap in VEPA mode.

On what device you attached it? Bridge? the physical nic?

On my physical host, ifconfig is showing the following devices :
- lo, obviously
- eth0, primary used
- wlan0, not used, WIFI...
- virbr0
- virbr0-nic

The last two devices were created when installing and playing with the KVM Virtual Machine Manager.

When trying to assign one of them to a VM, the only choices are :
- NAT
- eth0: macvtap
- wlan0: macvtap
- custom

and the source mode can be chosen between :
- Bridge
- VEPA
- Private
- Passthrough

My main goal is simplicity, and I'd rather use simple bridging, no NAT, simple.

What would be the simplest choice?

With Virtual Machine Manager you can edit-connection details and create bridges on the host that you can connect to.

I usually use an isolated network, that does not connect to the outside world and is limited to the host. If I need it to access the outside world, I can either connect one of the nics to the bridge created on the host or just create another vnic that uses nat/macvtap.

Note that VMM is mainly focused on simple VM connectivity, using it for nested virtualization is not simple and will require from you additional effort.

I'm not up to date with macvtap, but I think I understood that one of its limit was that no packet could be exchanged between the host and the guests. So far, this is leading me to access my own local VMs from another host. Too bad.

I'm also witnessing frequent loss of packets.

So far, I'm also seeing that guests can not ping each others, so I'm not going further before having solved these basic issues.

By definition: http://virt.kernelnewbies.org/MacVTap

I'm remembering the good old times of lots of bridges where my VMs could be reached by anyone (this was desired), but virt manager is not offering me this choice. I also would like to avoid NAT for other reasons.

To you all (4) people who are playing with nested oVirt :
- which is your preferred bare metal OS?
- which is your preferred guest (first virt level) OS?
- which network setups and modes are working best?

Thank you.

--
Nicolas ECARNOT
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-- Nicolas ECARNOT
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